(15440) Eioneus Jupiter Trojan
Discovered on 19 November 1998 by CSS at Catalina.
Eioneus was killed by a spear from Hektor.Naming citation (WGSBN Bull. 1, #1, 12), IAU / Minor Planet Center, via NASA/JPL
Where Eioneus is today
Seen from above the solar system on 2026-10-14: Eioneus is 5.36 au from the Sun and 6.20 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 15440 |
| Provisional designation | 1998 WX4 |
| Orbit class | Jupiter Trojan |
| Diameter | 62.5 km (#555 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.0720 |
| Rotation period | 21.4 hours |
| Absolute magnitude (H) | 9.59 |
| Orbital period | 12.1 years |
| Semi-major axis | 5.28 au |
| Perihelion – aphelion | 5.17 – 5.40 au |
| Eccentricity | 0.0213 |
| Inclination | 28.8° |
| Closest distance between its orbit and Earth's (MOID) | 4.25 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.